The function of the earth wire in an extra high voltage line is to
The function of the earth wire in an extra high voltage line is to
Right Answer is:
Provide a shield to the phase conductors from direct lightning stroke
SOLUTION
- Earth wire is also called the guard wire and it mainly protects lines from lightning.
- If in case lightning struck then it carries the excessive current inrush to ground.
- Its radius is much smaller than the actual transmission wire because as the resistance is inversely proportional to an area of cross-section and as the cross-section decreases, the resistance increases.
- The increased resistance of earth wire is able to withstand high inrush of current caused due to lightning and it will safely guide this inrush into the ground.
- It is placed above all the conductors mainly because if lightning struck then it will strike at the uppermost point in the line configuration and protect the actual conductors.